public class Test {
    public static void main(String[] args) {
        BinaryTree binaryTree = new BinaryTree();
        BinaryTree.TreeNode root =  binaryTree.createTree();
        binaryTree.levelOrder(root);
        System.out.println(binaryTree.isCompleteTree(root));
        StringBuffer str = new StringBuffer();
        (str.charAt(1).equals('(');
        str.append("hello");
    }
}
